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Encapsulate logical array-like declarations by using indexers.
Control read access to indexers by declaring get accessors.
Control write access to indexers by declaring set accessors.
Create interfaces that declare indexers.
Implement indexers in structs and classes that inherit from interfaces.
The previous chapter described how to use and implement properties as a means of providing controlled access to the fields in a class. Properties are useful for mirroring fields that contain a single value. However, indexers are invaluable if you want to provide access to items that contain multiple values, by using a natural and familiar syntax.
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